Pump



W. DICKENS Dec. 4, 1923.

PUMP

Filed Sept.'25 1920 mmvrax.

TGRNEY.

Patented Dec. 4, 1923.

elQl N-IITl2.-D STATES 1,476,609 PATENT ()F'F'EQE;.;

WILLIAM DICKENS, or PHILADELPHIA, PENNSYLVANIA; EoB'EErDIcKENs, ADMIN-ISTRATOR or SAID'WILLIAM DIcxENs, DECEASED, AssIGNoR oE'ONE IH'IRD TMAMIE A. BARNES AND ONETEIRD T0 EDWARD BARNES, BOTH or PHILADEL- 'PHIA,,PENNSYLVANIA.

PUMP? Application filed September 25, 1920. Serial No. 412,674.

The invention comprehends among other features a pump of a simpleconstruction and which is substantially of a duplex nature in that aplurality of pistons are employed on a single rod or shaft in a cylin-20 der, to compress and force air outwardly through a nozzle.

In the further disclosure of the invention reference is to be had to theaccompanying drawings, constituting a part of 25 this specification, inwhich similar characters of reference denote corresponding parts in allthe views, and in which,

Figure 1 is an elevation of the pump;

Figure 2 is a vertical sectional view taken through the pump, and

Figure 3 is a horizontal sectional view taken on the lines 3-3 in Figure2.

Referring more particularly to the View I provide a cylinder seated in asuitable base 11 with an auxiliary cylinder or tube 12 extendingupwardly from the base adjacent to the cylinder 10, the lower end of thetube being seated in an oflset portion 13 of the base with a crosspassage 14 connecting the interior of the cylinder 10 at its lower endwith the tube 12. The upper end of the tube extends into a block 15rigidly secured to the cylinder 10 by an encircling band 16 and theblock 15 carries a nozzle 17 which may be in the nature of a pipe forthe attachment of a flexible tube or hose 18 thereto, the block 15having a passage 19 communicating with the tube 12 and the nozzle 17 r Apiston rod 20 having at its upper end a cross handle 21, is mounted toreciprocate in the cylinder and is guided by a cap 22 through which thesaid piston rod loosely extends, said cap being threaded on to the upperend of the cylinder to close the same. The cylinder is preferablyprovided with an inlet opening 23 near its upper end and the piston rod20 carries a plurality of pistons 24:, one of which near the lower endof the stem is termed the lower piston, and the other of which is termedthe upper piston, the latter being situated about onehalf way up thepiston rod, and secured in position by an encircling tube 25 arranged toencircle the lower part of the piston rod and interpose between the twopistons, serving as a spacing and securing member therefor. The pistonsmay be of any desired construction and it will be seen that when thestem is moved into its uppermost position, its upward movement will belimited by its upper piston striking the cap 22 and at this time thelower piston, in its uppermost position will be disposed slightly lowerthan the nozzle 17 and which through the medium of a cross passage 26has connnunication with the interior of the cylinder at this point. Thecylinder 10 is divided by a partition or disk 30, and an air entrance isprovided at 31 for the lower portion. It will be apparent that when thestem is moved upwardly, the air above the upper piston will pass outthrough the bleed opening 23, while the air intervening the pistons 24will be forced through the nozzle 17 and tube or hose 18. Now when thepiston rod 20 is pushed downwardly the air admitted by the opening 23will be compressed by the descending upper piston and forced out throughthe nozzle 17 by way of the pas sage 26, and at the same time the aircompressed by the descent of the lower piston will be forced into thepassage 14 and thence up through the tube 12 and out through a thenozzle 17. 1

WVith this arrangement it will be seen that a substantially doubleacting pump is provided which although compressing air when the-cylinderis operated in one direction only, is of a duplex nature by reason ofthe provision of the two pistons, and thus with such a structure theplurality of the pistons will co-act to compress a large quantity of airand force it through the nozzle 17.

l Vith this arrangement furthermore, theusual leathers 27 which act aswashers do 7 not wear out as quickly as the structure for each piston isabout onehalf of the ordinary structure of a piston of the type nowgenerally used, the compression of the air be ing distributed betweenthe two pistons thus 5 preventing the parts from quickly Wearing out.

Having described my invention, I claim- A pump comprising a cylinder, atrans verse partition therein, a separate piston in each section or".said cylinder, a single piston rodcarrying both of said pistons, anozzle, and means for conducting air from both sections of said cylinderto said nozzle simultaneously.

In testimony whereof I afiix my signature.

WI LIAM "DICKENS.

